On a forward boing give the
yo-yo a little slack and allow it to go under the front of your non-throwhand
finger, but continue the boinging motion so that it goes under and
then continues back into the front string.

On a backward boing give the yo-yo a little slack
and allow it to go under the back of your non-throwhand finger, but continue
the boinging motion so that it goes under and then continues back into
the back string.

Repeat steps 2 and 3 a couple times then finish
the same way you would finish Boing
E Boing, roll forward, braintwister dismount.